package com.lei.controller;

import com.lei.common.R;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

/**
 * @author lei
 * @verson:1.8 文件上传与下载
 */
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String bathPass;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用uuid防止重名
        String s = UUID.randomUUID().toString() + substring;
        //创建一个对象目录
        File dir = new File(bathPass);
        if (!dir.exists()) {
            //目录不存在，需要创建
            dir.mkdirs();
        }
        try {
            //将临时文件转存指定位置
            file.transferTo(new File(bathPass + s));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(s);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        //输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(bathPass + name));
            //输出流，通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}
